A male given name from the Germanic languages, variant of Derek.

(transitive, chiefly passive) To cause (someone) to go insane or become deranged. / (transitive) To cause disorder in (something); to distort from its ideal state.

skin or skin disease

Laughably small or inadequate. / derisive; laughable; ridiculous

Any symptom, such as erythema, edema, and vesiculation, caused by exposure of the skin to a chemical compound.

Expressing or characterized by derision; mocking; ridiculing. / Deserving or provoking derision or ridicule.

(rare) A derisive remark.

Synonym of derailer: A device placed on railway tracks in order to cause a train to derail. / An instance of diverting a conversation or debate from its original topic.

(transitive) To cause to come off the tracks. / (intransitive) To come off the tracks. / (intransitive, figuratively) To deviate from the previous course or direction.

(mathematics) A derivative with respect to one variable of a function of several variables with the other variables held constant.